Originally Posted by Wity
Waste of money.
Ask your mum for a nail file from her handbag.
Or your daughter perhaps if you want a pretty one.
Well, OK, but if you want a more manly sanding board, get a 3x5-inch piece of scrap thin particle board and glue sandpaper to each side: #200 or so on one side and #400 or #600 on the other side. The board is not used to scrape usually, you just press the surface against the leather to get the impression of the sand into the surface. The smoother side can be used to fix fraying edges.
Many years ago I got a rectangular whetstone about the size of two cigarette packs stacked end-to-end with a rough surface on one side and a smooth surface on the other. The rough side is a good replacement for the sanding tool, and the fine side keeps my tip knife sharp.